Screw-driving machine



May 6, 1930. G. C. BROWN ET AL 1,757,614

SCREW DRIVING MACHINE Filed Dec. 14, 1928 9 SheetS-Sheet 1 I I 56 ll 0 II I 2 254v l I I 1 I 157' 0 I I 25 2 I! 259 E Ml. 24 7 245 2 I 'l-r1 mmGra 6. BT01]!!! Greyory HMWZl/{y May 6, 1930.

G. c. BROWN ET AL 7 1,757,614

SCREW DRIVING MACHINE Filed Dec. 14, 1928 9 Sheets-Sheet 2 gwuentow.

0rd LT Brawl;

Gregory KAfi Vull y I y 0- G. c. BROWN ET AL 1,757,614

SCREW DRIVING MACHINE lFiledDec. 14. 1928 9 Sheets-Sheet 4 I I l I, g H62 gm I I v amnion Q 670651011212 #12,, i W mug I. I a

Mayes,1930. G. CLIBROWN ET AL v $1,757,614 I SCREW-DRIVING MACHINE 1Filed Dec. 14, 1928 .9 sheets-sheer 5 1 gwue'ntow I May 6, 1930 G. c.BROWN Filed Dec. 14,

ET AL 1,757, 14

SCREW DRIVING MACHINE r 1928 9 SheetsSheet 6 l l I: I

\wlgxxxnl gumm amnion:

I I Gm 6. Brawn Grgory A/Wilt May 6, 1930. c, BROWN ET AL SCREW DRIVINGMACHINE Filed Dec. 14, 1928 9 Sheets-Shee-f T 7 67d Ewan Ghgya [MA May6, 1930. r BROWN AL i r 1,757,614

CREW DRIVING MACHINE Filed Dec. 14, 1928 [9 Sheets-Sheet 8 I May 6,1930. Q G. c. BROWN ET AL 1,757,614 scREw DRIVING MACHINE Fi1ed Dec 14,1928 9 Sheets-Sheet 9 Griz 6T Brawn gww ntom a machine of this characterhaving a maga zine tor contalmng the screws to be used in the PatentedMay 6, 1930 cm r T REYNOLDS MACHINE COMPANY, OF MASSILLON, OHIO, ACORPORATIOLTOF OHIO soanw-narviue Macrame ApplicationfilediDecember 14,1928. SeriaLNo'. 225,983.

The invention relates to machines for driving screws and is particularlyadapted for use in shops and factories for driving machine screws tofasten two or more parts together with greater speed and accuracy thanis possible manually.

The object of the improvement is to provide machine, an improvedescapement devicefor receiving the screws from the magazine one at atime and deliveringthem to a vertically movable foot which carries eachscrew to the work, a screw driver .belng co-ordlnated with ,the movementofthefoot for driving each screw into the work, means for automaticallydisengaging the foot from the screw and rai's- Y ing the foot above thedriver to permit the screw to be drlven home; means for driving screwsinto soft metals such as aluminum without the necessity of tapping holesin the indexing ,apparatusfor-carrying small pieces metal to receive thescrews; and'to provide an of work, the samebeingIco-ordinated with themovementof the screw driver. and foot to pcsiticn the work beneath thesame as the foot and screw driver are lowered.

An embodiment of the invention is illus-- trated 1n the accompanyingdrawlngs, in

which Figure 1 is a front elevation of the improved screw drivingmachine to which the invention pertains; l

Fig. 2, a side elevation showing the left side of the complete. machine;

Fig. 3, a similar view of the right side of.

the machine; I

g. 1, an enlarged plan view of the ma- Fig.7, a vertical'transvers'esection through the magazine, taken substantially on the line 7'4, Fig.5;

Fig. 8, an enlarged fragmentary section through the escapementmechanism, taken substantially on the line 8-8, Fig. 5;

plan section of the magazine and 6, a frontelevation of themagazine Fig.9, a detached perspective view of the escapeinent mechanism; I Figll0,avertical sectional vlew taken sub stantially onthe line 10-10, Fig.4,showing the driving head and associated parts;

can 0. BROWN AND season? 1?. MQN'ULTY, or MAssrnLoN, OHIO, AssIeNons ro-Fig. 11, an enlarged sectional view through the driving head takensubstantially on the line 11-11, Fig. 10; Fig.'12,

levers; V

Fig. 13, a detail sectional view showing the clutch releaseshaft'anda'ssociated parts; i

F l ha detail perspectivefview ofa portion of the clutch release shaftand the throwout cam;

mg. 15, a perspective view of the gearing and cams'for operat ng theapparatus;

Fig. 16, a detail sectional view with parts broken away, showing thecross slide and the vertical slide which carries'the foot, the screwdriver and foot being shown 1n ralsed pos1- tion" i Fig. 20, a sectionof thefriction mechanism in the driving-head taken substantiallyon theline 20 20, Fig. 11.

' Similar numerals refer to similar parts throughout the drawings.

Referringmore particularly to the embodiment illustrated in theaccompanying draw a section taken substantially on the line 12- 12, Fig,1, showing the cams and cam Fig; 17,'a-si1nilar view showing the footlowered and the driver n the act of drlvlng:

showing the driver ings, the machine may be supported uponan upright orstandard 21, having the base 22 at its lower'end and the housing'23 atits upper.

end the mechanism being housed'in' and upon the same. f

The work carrying table 2 1 is provided with the slide portion 25slidable. upon the vertical guides 26, on the standard, and adapted tobe vertically adjusted thereon by the nut .2 hi h; i threaded upon thestationary screw'29'and arranged to be rotated through thespiral gear 30and hand crank 31. I

mounted upon the arm The mechanism may bedriven by'a motor 32 which maybe mounted upon the base 22, the shaft 33 thereof havinga pulley 34fixed thereon for connection of a belt 35 which extendsover a pulley 36fixed upon the main driving shaft 37 journaled in abearing 38 upon thehousing. 7 I

A spiral gear 39 is fixed upon the opposite end vportion ofthe shaft, 37withinthe gear housing 40 and meshes with the spiral pinion 41 upon-thescrew driving shaft 42 located within the driving head housing43 whichis or bracket portion 44 of the main housing. 1

A spiral pinion 45 is fixed upon an inter V mediate port-ion ofthe'shaft 37 and meshes with a similar pinion 46 upon the worm shaft 47,the worm 48 thereon meshing with the worm gear 49 upon the clutch andcam shaft A spiral gear 51, fixed upon a shaft 52, also meshes with thespiral pinion 45. A spiral pinion 53 is fixed upon the shaft 52 andmeshes with a similar pinion 54 upon the worm shaft 55, the worm 56thereon meshing with the worm gear 57 upon the shaft 58.

A spiral pinion 59 is fixed upon the shaft 58 and meshes with a similarpinion 60 upon the brush shaft 61 upon whichis mounted the brush '62located within the magazine shown generallyat 63.

A pinion 64 is fixed upon an intermediate portion of the shaft 58 and.meshes with a gear 65 upon the vertical shaft 66 which is journaled in acentral hearingilug 67 carried by the radial arms 68 of themagazine. The

conical dial 69," which rotates within the lower portion of themagazine, is fixedupon "the lower end of the shaft 66.

The magazine'63 is substantially circular in plan view and comprises theannular side wall 70 having an inturned beveled flange 71 formed orfixed to its lower edge. The conicaldial 69 is inclined downward towardits periphery, which is located in the same horizontal plane with thebeveled flange 71 and spaced therefrom a distance corresponding to thediameter of the shanks of the screws to bedepo'sited thereon, and thecircumferential edge of the dial is likewise beveled at its upper faceas at 72, corresponding with the bevel of the flange 71. J

The periphery of the dial is spaced sufliciently from the flange 71 toform a circular space or runway into which the stems of the screws,supplied to the magazine, fall and are suspended by reason of the headsthereof resting on the beveled edges of the dial and flange 71;

The circular brush 62 is of such diameter that it will brush back anysurplus screws which may be carried forwardby the dial and allow onlythose to pass which are suspended by their heads in the annular runway.

A guard ring-73 is connected to the inner surface of the magazine andextends from a point beneath the center of the brush to a point beyondthe escapement' mechanism which will be later described. This guardringis" spaced above the flange 1, and the beveled periphery of the rotatingdial, a sufficient distance to allow theheads ofthe screws to passfreely beneath the ring when the screws are hanging vertically in theannular runway as indicated at A in Fig. 7. The ring, however, issufficiently close to the annular runway to prevent any screws passingbeneath the ring,fexcepting those which are suspended therein, in theproper position. e

Connected to the inner face of the magazine and extending" from theescapement mechanism to a point spaced from the rotary et arm 78 whichis fixed upon the vertical shaft 79 as by the key 80 and nut 81,-saidshaft being journaled in abearing boss 82 formed upon the outside of themagazine.

The segment 77 is located directly beneath the magazine and extendsacross the path of the screwssuspended in the annular runway and actsasa stop for thescrews' indicated at A in Fig. 5;. I

. A rocker arm 83 is fixed upon the upper end of the shaft 7 9' andconnected as by a ball and socket joint, indicated at'84, to an arm 85which is connected by a similar joint indicated at 86 to one arm 87 of abell crank journaled upon the shaft 88.

The other arm 89 of said bell crank is connected, as by a ball andsocket joint indi cated generally at 90, to a link 91 adapted'to beoperated by a cam mechanism to be hereinafter described. r

A slide plate 92 is fixed upon the top of the segment 77 as by thescrews 93 and is provided in its free end with a notch 94 registeringwith similar notches 95 and 96 in the segment 77 and arm 7 8respectively.

The notch 95 in the segment is in the form of an elongated slot withinwhich is slidably located the feed slide 97 having at its rear or innerend an upright stud 98 projecting through a slot 99in the slide plateand engaged by the bifurcation 100 in the sliding block 10 ed as by ascrew 103, with the rocker arm 104 fixed uponthe rocker shaft 88. Arocker arm 105 is fixed to the upper end of the shaft and connected asby a ball and socket joint 7 indicated at 106, to a link 1071eadi-ngtothe cam mechanism above referred to.

The cam mechanism lncludes a fixed upon the camshaft50 as by a key orspline 109. This hub is provided with a plushaft and mounted inbearings-119 upon; the frame 120 connected to one side of the 1 mainhousing as by the screws or bolts 121. Levers are mounted upon the shaftv118 for cooperation with the several cams.

The lever 122 is connected at one end to the link 91 and provided withthe rollers 123 and 124 for cooperation with the cam 114. A siinilarlever 125 is j ournaled upon the shaft 118 and connected to the'link107. This lever is provided with a rollercorresponding inpo sition tothe roller 123 for cooperation with the cam 115. V

Each of the levers 122 and has a rod 126 connected to its other end,said rod eX-' tending downward and rearward and slidably located througha lug 127 upon the frame 120, a coilspring 128 being located around therods 126 and interposed between the lugs 127 and the collars'129 at thefree ends of the rods, tending to normally urge the levers 122 and 125toward the cam hub. A lever 130 is ournaled upon the shaft 118 andprovided with a roller 131 adapted to 00* operate with the cam116. "Thislever is substantially LJ-shaped, the depending arm 132 thereofextending below the main housing and being connected to a link 133 whichop-, erates an indexing device which may be placed upon the table 24 forcarrying small work and automatically positioning the same beneath thescrew driver as will be later de-f scribed.

his indexing device may comprise .a base plate 134 adapted to bedetachably mounted upon the work table 24 and having a shaft 135journaled' therein, upon which is mount: ed the indexingdisk 136provided with any suitable arrangement of dowel apertures 137 forcarrying small pieces of work;

, A ratchet wheel 138 is fixed upon the shaft 135 and adapted to beengaged by a pawl 139 carried upon a lever 140 which is journaleduponthe shaft 135 and connected at its opposite end to the link 133. Thepawlis pivoted intermediateits ends upon the lever 140 asindicated at141 and is normally held in engagement with the ratchet wheel by meansof a pull spring'142 connected to the tail'end of the pawl and to thelever 140.

The cam-117 is adapted to engage the roller 143. carried upon the lever144 which is also journaled upon the rocker shaft 118, said lever havingan offset arm 145 adapted to'cooperate with the arm 146'of'a bell crankpivoted as at 147 upon the mainhousing,

hub 108 the other arm thereof. cooperating with the cross slide 149mounted in the horizontal v guide 150.

This cross slide has a vertical guide 151.

in whiclris mounted the verticalslide 152 carrying {the foot 76 whichconveys; the screws one at a time fromthe escapement mechanism to thework.

. The .guide150 has a rod 154 fixed to'one endthereof'as' byxthe endplate 155 and a coil spring 156 is located around said rod and.interposed between the end plate and the opposite end wall 157. of thecross slide, tend ing to normally urge said cross slidetoward theleft-as indicatedin Figs. 16 and 18.

For the purpose'of normally urging the vertical-slide 152 upward, to theposition shown in Fig. 16, a rod 158 is carriedby the .lug'159 ofthe'vertical guide portion 160,

of the cross slide. This rod extends upward andis slidable' through theendplate 161 of thevertical slide, a coil spring 162 being 10- catedaround the rod and interposed between v the lug 1 59 and the plate 161.p

The screw driving shaft'42 is journaled in a bearing 163, pivoted, as at164, to the bifurcated end:165 of the lever 166 which'is fulcrumedas at167 to the upper 'end of a link 168, pivotedas at 169 upon the arm 44 ofthe main housing.

vTheother end of the lever 166 is provided with a counterweight 170 tonormally urge the same toward the position'shown in Fig. 10 and arod 171has sli'dable thereon a sleeve 172 pivoted to this end portion of thelever, the lower end'of said rod being pivoted, as at 17 3',tothe endportion'of a lever 17 4,. fulcrumed at its other end as at 175 upon the.

arm 44 of thehousing. A coil spring 171 is interposed between the sleeve172 and a collar or nut 171 upon the rod.

A roller 176' is carried intermediate the ends of the lever 174 andcontacts with the periphery of the cam 177 fixed upon the cam shaft50. VI

The screw driver shaft 42 is slidably keyed as at 178 within the tubularshaft 179, upon whiclris fixed the spiral pinion 41. Below the pinion 41this tubular shaft is enlarged as at 180, the pinion resting againsttheupper shoulder 1810f saidenlarged portion of the shaft; r p

An antifric-tion bearing 182 engages the lower shoulder 183 of saidenlarged portion of thetubular shaft and is located within the annularrecess 1840f the driving head housing 43. A similar antifriction bearing185 forms a journal for the upper end portion of the tubular'shaf-t 179within the recess 186 in the upper portion ofthe housing 43. Nuts 187and 188 are provided for maintaining the tubular shaft in adjustedposition within said bearings. v i

The lower end of the shaft 42 is reduced as at 189 and located withinthe reduced upper ing. 25

40' shaft.

end of the driving .sleeve1190, being fixed thereto as by the transversepin 191, this driving sleeve being slidably mounted within the tubularshaft 179. i

I .The lower end portionfof the driving sleeve 7 190-is internallythreaded as at 192 and the 7 tube 193, which is located within thelower.

portion of the driving sleeve, is provided at its lower ends withthreads engaging said internal threads of the driving sleeve .and hasthe annular flan e 194 en a in the lower a z: a: a

end of the driving sleeve. 1

A bushing ring 195 is threaded-within the lower internallythreadedportion 196 vof the tube 193 and'provided at its lower end with1 the annular flange 197 engaging the lower end of the tube. V i A r Aball bearing 198 is mounted against the internally shouldered portion199 of the driving sleeve and j ournaled therein is a shaft 200 havingthe shoulder 2011 around which is locatedthe collar 202 pinned to saidshaft as by the pin 203 directly beneath the ball bear- A ring 204 isthreaded into the internally threaded upper'portion 205 of the tube 193anda coil spring 206 is interposedbetween said ring and a ring 207 whichcontactswith the internal annular flange 208 formed intermediate theends of the tube 193.

The lower reduced end 209 of the ring 207 contacts with a series offrictiondisks 210 and 211 connected, respectively, to the tube 193 andthe squared portion 212 of the shaft to engage a similar lug 219 at theupper end of the screw driver tool 220, which is received within saidsocket sleeve and held fixed there- .in as by the set screw 221. f

A lug 222 may be fixed upon the bearing 163 and fixed therein, as by thescrew threads 223, is a depending push rod 224 held in ad justedposition upon the lug as by the lock nut 225. This pushrodis slidablylocated through a bore 226 in the arm 44 and arranged to contact withthe lug 227 upon the vertical slide 152 to lower said slide foot 76 asshown in Fig. 17. f It should be noted that this foot is offset from thevertical slide as indicated at 228 and with it the and is provided withthe slot 229 adapted to register with the notch 94 in the slide plate toreceive a screw therefrom, in the position illustrated in Figs. 5 and19.

The Worm gear 49 is rotatably mounted upon the cam shaft 50 and adaptedto be con- The disks 210 are connected tothe tube 193 by means of thelugs 213 received in the.

nected thereto as by a clutch indicated generally at 231, said clutchhaving an annular groove'232 in which are located shoes'233 carried bythe rods 234 slidably located through bearings'235 and connected toacrosshead236 havinga bifurcated portion 237thereon.

' A lever 238 is pivotedatiits upper end to the bifurcation .237 andfulcrumed interme diate its ends, as at 239, upon a link 240 piv oted asat 241 upon'the main housing. The

lower portion of the lever is pivotally connected as at 242 to theclutch operatingrod 243 which is slidably located through the mainhousing and may be parallel to the cam shaft. J V V v r This clutchrodhas. a collar 244 fixed thereon arranged to be engaged by one arm 245 ofa bell crank pivoted as at 246'upon a bracket 247' carried by thehousing, the other arm' 248 thereof being pivotally connected as at 249.

to the depending link 250. r V

This link'efiends downward along the side of the upright or standard 21to a point adjacent to the base 22 where it is pivotally connected as at251 to a bell crank segment 252 fulcrumed as at 253 upon the side of thestandard or upright. 1 e T A link 254 is pivotally connected, as at251*,

to the bell: crank segment and extends forupon the main housing and isslidably and rotatably located through a cam sleevet262 having theV-shaped notches .262 in its'outer end adaptedto be engaged by thesimilarly shaped cam lugs 263 upon the collar 264 which is fixed uponthe outer end of the rod as bythe set screw 265 and nut 266.

A radial lug 267'is formed upon the cam sleeve and adaptedto be engagedby the peripheral lug 268 fixed upon the disk 269 as by the bolt 270;This disk is fixed upon one end of the cam shaft 50.

The operation of the machine is as follows: Assuming the parts to be inthe normal or initial position, the screw driver and push rod 224 areraised as-shown inFig. 10, the screwdriver shaft is continuouslyrotating, the conical dial 69 in'themagazine is-rotating in thedirection of the arrow shown on Fig. 5, the brush 62 is rotating in thedirection of the arrowv shown on Fig. 7, the worm gear 49 iscontinuously rotating upon the] cam shaft 50, the cam shaft itselfremaining stationary.

The segment 77 is standing in the position shown in Fig. 5, preventingmovement of the screws within the annular runway of the magazine, thefeed slide 97 associatedwith the segment'isin the "rearward orinoperative position shownin Figs. 8 and 9, the

cross slide l49is in the normal position and the vertical slide is-inthe raised position with 76 being raised as shown in said figure andpositioned to register, with the notch in the segment 77 as shownin Fig.5Q

The operator then depresses the treadle 258 with his foot and throughthe link 254, bell crank segment 252, link250 and bell crank 245 -248(see Fig, .13) andcollar 244, the clutch operating rod 243-, is-pulledinto the POSltlOl'LSllOWIl inFig. 13, meshing the cam lug 263, upon thecollar 264, with the cam recess 262 in the sleeve 262. Through the lever238 thepins 234 are moved inward and through the shoes 233 the clutch231 is thrown in, coupling the worm gear 49 upon the cam shaft andcausing the same to rotate slowly.

The cam 114 will first engage theroller 124 upon the lever 122, andthrough the rod 91, bell crank v87-89, link 8.5, and rocker arm 83, therocker shaft 7 9, and with it the segment 77, willberotated towardtheleft until the notch therein registers with the annular runway in themagazine, permitting the foremost screw, shown at A in. Fig. 5, to entersaid slot.

The cam 114 will then contact with the rocker shaft 79 will be movedback inthe opposite direction, swinging the segment 77 back intov theposition shown in Fig. 5, pre

venting further movement of the screws in the annular runway ofthemagazine and registering the notch 95 in the segment with the notch229 in -the foot 7 6.- V The cam 115 will at that instant engage theroller upon the lever 125, pulling the link 107 and through the rockerarm 105' the rocker shaft 88 will be rocked, rocking the arm 104 thereoftoward the segment 77. Through the link 102, block 101and pin 98, thefeed slide 97 will be moved outward, ejecting the screw, shown .at A 1nFig. 8, from the notch in' the segment and transferring the same intothenotch 229 of the foot 76.

As soon as these operations have taken place, the springs 128 willreturn the levers 122 and 125 to the normal or initialpositions.

The cam 177 will then operate, through the lever 174,.-link 171 andspring 171* and lever- .166 to lowerthe screw driver and the push rod224 simultaneously. This lowering of the push rod will, through the lug227, lower the vertical slide 152, and with it the foot 76, totheposition shown in Fig. 17, positioning the screw A withvre ferenc e tothework, the. screw driver, which is continuously rotatthe work. 7

ing, engaging the screw and driving it into Before the screw is home,the foot 76 will be disengaged therefrom by the pressure of the arm 148of the bell crank 146-448 against the cross slide, moving the crossslide, and with the vertical slide, sufficiently to disengage the lug227 of thevertical slide fronrrbeneath the push rod.

. The spring 158 will immediately return.

the vertical slide to the upper position as shown in Fig. 18, the lug227 thereof resting against the side of the push rod 224; As the screwis driven home in the work, thecam 177 will operate, in conjunction withthe counterweight- 170, to return the screwdriver and push rod to theinitial or raised position shown in Figs. 10 and 16, permitting the"spring 156 to force the cross slide, and with it the vertical slide,back to the initial position, with the lug 227 positioned beneath thepush V 7 rod, as shown in Fig. 16.

At this point the lug 268 upon the disk 269 will engage the radial lug267 uponthe, cam sleeve 261, rotating the same to force the cam lug 263,upon the collar 264, out of engagement with the cam recess 262 of thesleeve, drawing the clutch operating rod 243 to the left and releasingthe clutch, causing the cam shaft to stop rotating with the parts all returned to the initial position.

small pieces of work, the indexing attachment may be mountedupon thetableand the work positioned,by means of the indexing disk 136. V

With each complete operation of the machine as above described, the cam116 will operate the L-shaped-leverwand through jigs or the like upon 3the link 133, lever140, pawl 141 and ratchet .138, the indexing diskwill bemoved a sufliperipherallug 268 fromthecam disk 269.

Thus it will be seen that when thetreadle is depressed, the operation ofthe machine will bestartecl and will continue indefinitely since thereis no means for throwing out the clutch at the end of each cycle oroperation.

The machine will, therefore, continuously operate to convey successivescrews from the magazine by the escapement mechanism to the receivingfoot which; Carries them tofih ,work,the screwdriver operating atltheprop- The work may be carried directly upon the table 24 or if it isdesired to operate upon 'ma azine for containin screws an esca3ementmechanism immediately adjacent tothc magazine for feeding screwsfrom the magazine, a foot arrangedto cometo a position immediatelyadjacent to the escapement mecha- "nism for receiving the screws fromthe escapementmechanism and conveying them directly to the work, a screwdriver'for driving the screws into the work, and means for lowering thefoot and screwdriver to the work immediately after the delivery of ascrew to the foot. a

2. A screw; driving machine including a magazine for containing screws,an escapement mechanism immediately adjacent to the magazine for feedingscrews from the magazine, a foot arranged to come to a positionimmediately adjacent to the escapement mechanism for receiving thescrews from the escapement mechanism and conveying them directly to thework, a screw driver for driving the screws into the work, means forlowering the foot and screw driver to the work immediately after thedelivery of a screw to the foot, and means for withdrawing the footafter thescrew driver has started to drive the screw into the work. I

3. A screw driving machine including a magazine for containingscrews, anescapement mechanism immediately adj acent to the magazine for feedingscrews from the magazine, a foot arranged to come to a positionimmediately adjacent to the escapement mechanism for receiving thescrews from the escapement mechanism and conveying them directly tothework, a screw driver foridriving the screws intothe work, means forlowering the foot and screw driver to the work immediately after thedelivery of a screw to the 'foot, means for withdrawing the foot afterthe screw driver has started to drive the screw into the work, and meansfor returning the foot to a position adjacent to the escapementmechanism and for raising the screw driver after the screw is driveninto the work.

4;. A screw driving machine including. a magazine for containing screws,an escapement mechanism comprising a segment immediately adjacent to themagazine arranged to normally prevent delivery of screws from themagazine and having a notch adapted to receive one screw at a time,means for moving the segment to receive a screw directly from themagazine, and screw holding and driving means arrangedto receive eachscrew directly from the segment.

5. A screw driving machine including a magazine for contain ng screws,an escapement mechanism comprising a segment immediately adjacent tothe' magazine arranged to normally prevent delivery of screws from themagazine and having 'a notch adaptedto re celve one screw at a time,means for moving the segment to receive ascrew directly from themagazine, screw. holding and driving means arranged to receive eachscrew directly from the segment, and means for-ejecting each screw fromtlie'segment and delivering it directly as thes'crew holdingand drivingmeans. 7 i

6. A screw driving machine 'includingai" magazine for containing'screws,an escapement mechanism'comprising a' segment immediately adjacent tothe magazine arranged to normally'prevent delivery of screws from themagazine and having a notch adapted to o "receive one screw at a time,means for moving the segment to receive a screw. directly from themagazine, screw holding and driving r means arranged-to receive eachscrew directly from the segment, and a feed slide asso ciated with thesegment for ejecting each screw from the segment and delivering itdirectly to the screw holding and driving means.

7. A'screw driving machine including a magazine for containing screws,an escape ment mechanism immediately adjacent tothe' magazine forfeeding screws from the magazine, a foot arran'gedto come to a positionimmediately adjacent to the escapement mechanism for receiving thescrews from the escapement' mechanism and conveying them directly to'thework, a screw driver for driving the screws into the work, and a'singlecam means for automatically lowering the foot and screw driver to thework immediately after the delivery of a screw to the foot;

8. A screw-driving machine including a magazine for containing screws, afoot ar ranged to come to a position adjacent to the magazineforreceiving the screws from the magazine and conveying them directly tothe work, a screw driver for driving the screws into the Work, means forlowering the screw driver to the work and a push rod operated by saidmeans for simultaneously lowering the foot to the work. y V

9. A screw driving machine including a Vmagazine for'containing screws,a foot arranged to come to arpositi'on adjacent to the magazine forreceiving thescrews from the magazine and conveying them directly to thework, a screw driver for driving the screws into the work, cam means forloweringthe screw driver to the work and a push rod operated by saidmeans for simultaneously lowering the foot to the work. o

10. A screw driving machine including a magazine for containing screws,escapement mechanism immediately adjacent to the magazine forfeedingscrews from the magazine, means arranged to come to a positionimmediately adjacent to the escapement mechanism for receiving thescrews from the escapement mechanism and conveying them directly to thework, means for driving the screws into the work, means forautomatically lowering the receivin means and driving means to the V Ding the receiving means and driving means to delivery of aworkimmediately after the delivery of a screw to the receiving means, andmeans for continuously operating the mechanisms in sequence tocontmuously drive successlve screws.

11. A screw driving machine including a magazine for containing screws,escapement mechanism immediately adjacent to the magazine for feedingscrews from the magazine,

means arranged to come to a position immediately adjacent to theescapement mechanism for receiving the screws from the escape-v mentmechanism and conveying them directly to the work, means for driving thescrews into the work, and means for automatically lowerthe workimmediately after the screw to the receiving means.

12. A screw drivingmachine including a magazine for containingscrews, anescapement mechanism immediately adjacent to the magazine for feedingscrews from the magazine, a foot for receiving the screws directly fromthe escapementmechanism and conveying them directly to the work, a screwdriver for driving the screws into the work, a cam shaf a cam on theshaft for operating the escapement mechanism, a lever, a cam on theshaft for operating the lever. the screw driver being operativelyconnected to the lever, and a push rod operatively connected to thelever for lowering the, foot.

13; A screw driving machine including a magazine for containing screws,an escapement mechanism immediately adjacent to the magazine for feedingscrews from the magazine, a foot for receiving the screws directly fromthe escapenient mechanism and conveying them directly to the work, acombined horizontal and vertical slide mechanism carrying the foot, ascrew driver for driving the screws into the work, a cam shaft, a cam onthe shaft for operatingthe escapement mechanism, a lever, a cam on theshaft for operat ing the lever, the screw driver being operativelyconnected to the lever, and a push rod operatively connected to theleverfor lowering the slide mechanism.

14-. A screw driving machine including a magazine for containing screws,an escapement mechanism immediately adjacent to the magazine andincluding a pivoted segment and a feed slide for feeding screws from themagazine, a foot for receiving the screws directly from the escapementmechanism and conveying them directly to the work, a screw driver fordriving the screws into the work, a cam shaft, a cam on the shaft foroperating the segment, a camon the shaft for operating the feed slide, alever, a cam on the shaft for operating the lever, the screw driverbeing operatively connected to the lever, and. a-

pnsh rod operatively connected to the lever for operating the foot.

15. A screw driving machine including a magazine for containingscrews,an escapement mechanism immediately ad acent to the ma azine: andincluding a pivoted segment and a feed slide for feedingscrews from themagazine, a foot for receiving the screws directly from the escapementmechanism and conveying them directly 'to the work, a combinedhorizontal and vertical slide mechanism carrying the-foot, a screwdriver for drivin the screws intothe work, a cam shaft,

a cam on the shaft for operating the segment, a cam on the shaft foroperating the feed slide, a lever, a cam on the shaft for operatzine, afoot for receiving the screws directly from the escapement mechanism andcon veymg them directly to the work, a screw driver fordriving thescrews into the work, a cam shaft, a cam on the shaft for operating theescapement mechanism, a lever, a cam on the shaft for operating thelever, the screw driver being eperatively connected to" the indexingdevice, and a push rod operative ly connected to the lever for loweringthe foot.

In testimony that we claim' the above, we have hereunto subscribed ournames,

"GRA G. BROWN. 1 GREGORY F. MGNULTY."

lever,anindexing device below the screw driver, a cam on the shaft foroperating the

